Sewage Map

Coldharbour Lane Hildenborough Rear 30 CSO - 108612

Storm overflow operated by Southern Water. The source names The Hilden Brook as the receiving water.

19
Spills in 2025
232.8
Recorded hours
85.7%
Monitor operation
6
Years listed
Current status unknown

Checking the latest monitor report…

Open official annual data ↗

How it compares in 2025

Coldharbour Lane Hildenborough Rear 30 CSO - 108612 recorded 19 spills in 2025. That is more than 62% of the 14,239 overflows in England with a reported figure, and ranks 5,217th nationally. Among Southern Water overflows it ranks 284th of 975; the median Southern Water overflow recorded 7 spills. On the Hilden Brook waterbody it ranks 2nd of 4.

The monitor worked for 85.7% of 2025, so this count may be low and its rank may understate activity.

GroupRank by spillsMedian spillsMedian hours
This outlet–19232.8
England5,217th of 14,2391122.3
Southern Water284th of 975717
Hilden Brook2nd of 413147.1

Rank 1 has the most spills. Equal counts share a rank. Only overflows with a reported count are ranked. Counts do not measure volume, so a higher rank does not mean more sewage.

Annual spill history

n/a2020n/a2021n/a2022n/a202302024192025
From 2024 to 2025, the reported count went from 0 to 19 spills. The highest count was 19 in 2025 and the lowest was 0 in 2024. The monitor worked for less than 90% of 2024, 2025, so those counts may be low.Amber bars mark years when the monitor worked for less than 90% of the year.
YearSpillsDurationMonitor operationSource
202519232.8 hours85.7%Low coverageOfficial data
202400 hours67.6%Low coverageOfficial data
2023UnknownUnknown0%Low coverageOfficial data
2022UnknownUnknownUnknownOfficial data
2021UnknownUnknownUnknownOfficial data
2020UnknownUnknown0%Low coverageOfficial data

A missing figure means the source did not provide a usable value. A zero is shown as zero. Monitor operation below 90% can make comparison less reliable.

Outlet details

Water company
Southern Water
Outlet type
Storm overflow on the sewer network
Permit
A00415
Activity reference
Storm
Grid reference
TQ5755049110
Waterbody ID
GB106040018170Official waterbody record ↗
Location source
Official annual grid reference
Location precision
About 1 metres
Location note
Unknown

About the name and type

The annual return lists this asset as “SO on sewer network”: storm overflow on the sewer network. The return places this overflow on the sewer network.

The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.

Where it is

The recorded position is about 0.7 km east of the Hildenborough reference point in the ONS built-up areas data.

Area and water pages

Check the official record

Public access to this outlet is unknown. Do not enter restricted land or use this page as a route guide.

Open official source ↗

Other outlet records nearby

Questions about Coldharbour Lane Hildenborough Rear 30 CSO - 108612

Who operates Coldharbour Lane Hildenborough Rear 30 CSO - 108612?
Southern Water is the operator named in the annual record. The permit reference is A00415.
Where does Coldharbour Lane Hildenborough Rear 30 CSO - 108612 discharge?
The source names The Hilden Brook as the receiving water. This does not show how far a discharge travelled.
How many times did Coldharbour Lane Hildenborough Rear 30 CSO - 108612 spill in 2025?
The 2025 return records 19 counted spill events and 232.8 hours of recorded discharge. Spills are counted with the 12/24-hour method, so this is not a count of every start signal.
Can I trust the 2025 figures for this outlet?
The monitor worked for 85.7% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
Is Coldharbour Lane Hildenborough Rear 30 CSO - 108612 discharging right now?
This record is linked to a company live feed. The panel above shows the latest report we hold, with its date. That report can be old, and the monitor can be offline, so check the date before relying on it. A report that no discharge is taking place is not a water-quality result.
How accurate is the map marker?
The marker comes from the grid reference in the official annual return, which is accurate to about 1 metres. It shows the recorded outlet position, not the extent of any discharge.
What kind of outlet is Coldharbour Lane Hildenborough Rear 30 CSO - 108612?
The annual return lists the asset type as “SO on sewer network”, which means storm overflow on the sewer network. The return places this overflow on the sewer network.
How does Coldharbour Lane Hildenborough Rear 30 CSO - 108612 compare with other overflows?
Coldharbour Lane Hildenborough Rear 30 CSO - 108612 recorded 19 spills in 2025. That is more than 62% of the 14,239 overflows in England with a reported figure, and ranks 5,217th nationally. Among Southern Water overflows it ranks 284th of 975; the median Southern Water overflow recorded 7 spills. On the Hilden Brook waterbody it ranks 2nd of 4. Ranks compare counted spill events only. They do not compare volume or harm.
Does zero spills mean the water was safe?
No. A zero means the annual return recorded zero counted spill events for this outlet and year. It is not a water-quality test, and pollution can come from other sources.